It took less than four minutes for the Swedish striker, playing
on familiar territory at Gothenburg's Ullevi Stadium, to open his
account, acrobatically despatching an Antonio Valencia cross from
the right.

Wayne Rooney (two), Marouane Fellaini and Juan Mata also found
the net for United, but new boss Jose Mourinho will be disappointed
with the defending for the goals from Sinan Gumus and Bruma that
left his side trailing 2-1 at the break.

Ibrahimovic was partially responsible for Galatasaray's
equaliser midway through the half, needlessly giving away a foul 10
yards outside his own box.

One-time United transfer target Wesley Sneijder whipped in the
resulting free-kick and the unmarked Gumus was left with the simple
task of nodding the ball past the helpless David De Gea.

For Galatasaray's second goal five minutes before the break,
United were guilty of granting Bruma too much time and space on the
edge of the box and the Portugal Under-21 international took full
advantage by bending a superb shot into the far corner.

Mourinho responded by introducing Marcus Rashford, Fellaini,
Ashley Young, Michael Carrick and Jesse Lingard at the start of the
second half, with Ibrahimovic and Anthony Martial among those to
make way.

And the changes paid off almost immediately as Rooney scored
twice in the space of four minutes to turn the game on its
head.

Rooney's first was a close-range finish after Valenica supplied
a fine cut-back from the byline, while the second came from the
penalty spot.

It was Rooney who played Rashford in and, when the teenage
striker was hauled down by Galatasaray goalkeeper Fernando Muslera
following neat footwork, United's skipper duly converted the
spot-kick.

The Super Lig side were still reeling three minutes later when
Valencia again got away down the right before picking out Fellaini
whose back-post header looped in to make it 4-2.

Mata completed the scoring 15 minutes from time, taking
advantage of some sloppy defending to turn home Carrick's low cross
from three yards out.

Next on the agenda for United is Rooney's testimonial against
Everton, followed by Sunday's Community Shield clash with Leicester
City.